122 lines
5.7 KiB
C
122 lines
5.7 KiB
C
/***********************************************************************
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Copyright (c) 2006-2010, Skype Limited. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, (subject to the limitations in the disclaimer below)
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are permitted provided that the following conditions are met:
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- Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of Skype Limited, nor the names of specific
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contributors, may be used to endorse or promote products derived from
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this software without specific prior written permission.
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NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED
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BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
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BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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***********************************************************************/
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#ifndef SKP_SILK_PERCEPTUAL_PARAMETERS_FIX_H
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#define SKP_SILK_PERCEPTUAL_PARAMETERS_FIX_H
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/* reduction in coding SNR during low speech activity */
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#define BG_SNR_DECR_dB_Q7 (3<<7)
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/* factor for reducing quantization noise during voiced speech */
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#define HARM_SNR_INCR_dB_Q7 (2<<7)
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/* factor for reducing quantization noise for unvoiced sparse signals */
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#define SPARSE_SNR_INCR_dB_Q7 (2<<7)
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/* threshold for sparseness measure above which to use lower quantization offset during unvoiced */
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#define SPARSENESS_THRESHOLD_QNT_OFFSET_Q8 (3<<6) // 0.75
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/* noise shaping filter chirp factor */
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#define BANDWIDTH_EXPANSION_Q16 61604 // 0.94
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/* difference between chirp factors for analysis and synthesis noise shaping filters at low bitrates */
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#define LOW_RATE_BANDWIDTH_EXPANSION_DELTA_Q16 655 //0.01f
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/* factor to reduce all bandwidth expansion coefficients for super wideband, relative to wideband */
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#define SWB_BANDWIDTH_EXPANSION_REDUCTION_Q16 (1<<16) // 1.0f;
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/* gain reduction for fricatives */
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#define DE_ESSER_COEF_SWB_dB_Q7 (2 << 7)
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#define DE_ESSER_COEF_WB_dB_Q7 (1 << 7)
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/* extra harmonic boosting (signal shaping) at low bitrates */
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#define LOW_RATE_HARMONIC_BOOST_Q16 6554 // 0.1
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/* extra harmonic boosting (signal shaping) for noisy input signals */
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#define LOW_INPUT_QUALITY_HARMONIC_BOOST_Q16 6554 // 0.1
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/* harmonic noise shaping */
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#define HARMONIC_SHAPING_Q16 19661 // 0.3
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/* extra harmonic noise shaping for high bitrates or noisy input */
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#define HIGH_RATE_OR_LOW_QUALITY_HARMONIC_SHAPING_Q16 13107 // 0.2
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/* parameter for shaping noise towards higher frequencies */
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#define HP_NOISE_COEF_Q16 19661 // 0.3
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/* parameter for shaping noise extra towards higher frequencies during voiced speech */
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#define HARM_HP_NOISE_COEF_Q24 7549747 // 0.45
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/* parameter for applying a high-pass tilt to the input signal */
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#define INPUT_TILT_Q26 2684355 // 0.04
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/* parameter for extra high-pass tilt to the input signal at high rates */
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#define HIGH_RATE_INPUT_TILT_Q12 246 // 0.06
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/* parameter for reducing noise at the very low frequencies */
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#define LOW_FREQ_SHAPING_Q0 3
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/* less reduction of noise at the very low frequencies for signals with low SNR at low frequencies */
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#define LOW_QUALITY_LOW_FREQ_SHAPING_DECR_Q1 1 // 0.5_Q0
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/* fraction added to first autocorrelation value */
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#define SHAPE_WHITE_NOISE_FRACTION_Q20 50 // 50_Q20 = 4.7684e-5
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/* fraction of first autocorrelation value added to residual energy value; limits prediction gain */
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#define SHAPE_MIN_ENERGY_RATIO_Q24 256
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/* noise floor to put a low limit on the quantization step size */
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#define NOISE_FLOOR_dB_Q7 (4 << 7)
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/* noise floor relative to active speech gain level */
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#define RELATIVE_MIN_GAIN_dB_Q7 -6400 // -50_Q0 = -6400_Q7
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/* subframe smoothing coefficient for determining active speech gain level (lower -> more smoothing) */
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#define GAIN_SMOOTHING_COEF_Q10 1 // 1e-3_Q0 = 1.024_Q10
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/* subframe smoothing coefficient for HarmBoost, HarmShapeGain, Tilt (lower -> more smoothing) */
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#define SUBFR_SMTH_COEF_Q16 26214 // 0.4
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#define NOISE_GAIN_VL_Q16 7864
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#define NOISE_GAIN_VH_Q16 7864
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#define NOISE_GAIN_UVL_Q16 6554
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#define NOISE_GAIN_UVH_Q16 9830
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#ifdef __cplusplus
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}
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#endif
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#endif //SKP_SILK_PERCEPTUAL_PARAMETERS_FIX_H
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